When asked why Torchwood is so popular, Barrowman explained: "I think it's because [audiences] can relate to the characters. Although we're sci-fi and we have a heightened reality and we do very 'bigger than life' things, the relationships between the characters and the personalities - if I can toot our own horns a little bit - we bring a little bit to it... People can relate to it, and I think that's important.

"We represent everybody out there. If you watch it, you can find some of yourself in one of the characters."

Myles added: "Yeah, as John says, there's huge sci-fi elements in it, but there's an awful lot of domestic drama in as well.

"There's [also] great humour in it - for all the dark moments, you've got something humorous to kind of lighten it."

Torchwood: Miracle Day continues on Fridays at 9/8c on Starz in the US and on Thursdays at 9pm on BBC One in the UK.